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ACPI: don't walk tables if ACPI was disabled

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Ingo Molnar wrote:
> -tip auto-testing started triggering this spinlock corruption message
> yesterday:
>
> [    3.976213] calling  acpi_rtc_init+0x0/0xd3
> [    3.980213] ACPI Exception (utmutex-0263): AE_BAD_PARAMETER, Thread F7C50000 could not acquire Mutex [3] [20080321]
> [    3.992213] BUG: spinlock bad magic on CPU#0, swapper/1
> [    3.992213]  lock: c2508dc4, .magic: 00000000, .owner: swapper/1, .owner_cpu: 0

This is apparently because some parts of ACPI, including mutexes, are not
initialized when acpi=off is passed to the kernel.

Reported-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
This commit is contained in:
Vegard Nossum 2008-06-20 15:39:09 +02:00 committed by Andi Kleen
parent 860f0c6b3d
commit d185705690
1 changed files with 3 additions and 0 deletions
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3
drivers/acpi/glue.c
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@ -333,6 +333,9 @@ static int __init acpi_rtc_init(void)
{
struct device *dev = get_rtc_dev();
if (acpi_disabled)
return 0;
if (acpi_disabled)
return 0;